If you use the command 'exit' you can shift to the EFI menu, but changing the settings doesn't seem to affect the progress of the UEFI Interactive Shell, which stops at the Shell> prompt. Choose your version (if you have Mojave or Catalina, choose Mac OS X (64 bit)). Installation in VirtualBox Virtualbox For Macbook This is your file for installation in VirtualBox.
After conversion completes, you will see a.Also choose the name for installer disk and the final destination.